linux-kernel - Re: [Y2038] [PATCH 3/8] powerpc: fix vdso32 for ppc64le

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 20 Nov 2019 20:35:07 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Y2038] [PATCH 3/8] powerpc: fix vdso32 for ppc64le

On Wed, Nov 20, 2019 at 8:13 PM Ben Hutchings
<ben.hutchings@...ethink.co.uk> wrote:
>
> On Fri, 2019-11-08 at 21:34 +0100, Arnd Bergmann wrote:
> > On little-endian 32-bit application running on 64-bit kernels,
> > the current vdso would read the wrong half of the xtime seconds
> > field. Change it to return the lower half like it does on
> > big-endian.
>
> ppc64le doesn't have 32-bit compat so this is only theoretical.

That is probably true. I only looked at the kernel, which today still
supports compat mode for ppc64le, but I saw the patches to disable
it, and I don't think anyone has even attempted building user space
for it.

       Arnd